(19)

(11)

EP 4 078 260 A1

(12)

(43) Date of publication: 26.10.2022 Bulletin 2022/43 (21) Application number: 20842473.9 (22) Date of filing: 18.12.2020

(51) International Patent Classification (IPC):  G02B 7/182(2021.01) G02B 26/08(2006.01) G02B 5/08(2006.01) B23K 26/08(2014.01) (52) Cooperative Patent Classification (CPC): G02B 7/1822; G02B 5/08; G02B 26/0816 (86) International application number: PCT/US2020/065807 (87) International publication number: WO 2021/127312 (24.06.2021 Gazette 2021/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 20.12.2019 US 201916722283 (71) Applicant: Southwest Research Institute San Antonio, Texas 78238-5166 (US)	(72) Inventors: REAM, Stanley, L. Columbus, OH 43235 (US) WALTERS, Craig, T. Powell, OH 43065 (US) FLANNIGAN, William, C. San Antonio, TX 78212 (US) (74) Representative: Nederlandsch Octrooibureau  P.O. Box 29720 2502 LS The Hague 2502 LS The Hague (NL)